Kernel: Introduce a new HID subsystem

The end goal of this commit is to allow to boot on bare metal with no
PS/2 device connected to the system. It turned out that the original
code relied on the existence of the PS/2 keyboard, so VirtualConsole
called it even though ACPI indicated the there's no i8042 controller on
my real machine because I didn't plug any PS/2 device.
The code is much more flexible, so adding HID support for other type of
hardware (e.g. USB HID) could be much simpler.

Briefly describing the change, we have a new singleton called
HIDManagement, which is responsible to initialize the i8042 controller
if exists, and to enumerate its devices. I also abstracted a bit
things, so now every Human interface device is represented with the
HIDDevice class. Then, there are 2 types of it - the MouseDevice and
KeyboardDevice classes; both are responsible to handle the interface in
the DevFS.

PS2KeyboardDevice, PS2MouseDevice and VMWareMouseDevice classes are
responsible for handling the hardware-specific interface they are
assigned to. Therefore, they are inheriting from the IRQHandler class.

1 files changed, 84 insertions, 0 deletions

diff --git a/Kernel/Devices/HID/HIDManagement.h b/Kernel/Devices/HID/HIDManagement.h
new file mode 100644
index 0000000000..00173f02dd
--- /dev/null
+++ b/Kernel/Devices/HID/HIDManagement.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/CircularQueue.h>
+#include <AK/NonnullRefPtrVector.h>
+#include <AK/RefPtr.h>
+#include <AK/Time.h>
+#include <AK/Types.h>
+#include <Kernel/API/KeyCode.h>
+#include <Kernel/API/MousePacket.h>
+#include <Kernel/KResult.h>
+#include <Kernel/SpinLock.h>
+#include <Kernel/UnixTypes.h>
+#include <LibKeyboard/CharacterMap.h>
+
+namespace Kernel {
+
+class HIDDevice;
+class I8042Controller;
+class MouseDevice;
+class KeyboardDevice;
+class KeyboardClient;
+class HIDManagement {
+    friend class KeyboardDevice;
+    friend class MouseDevice;
+    AK_MAKE_ETERNAL;
+
+public:
+    HIDManagement();
+    static void initialize();
+    static HIDManagement& the();
+
+    void enumerate();
+
+    const String& keymap_name() const { return m_character_map.character_map_name(); }
+    const Keyboard::CharacterMapData& character_maps() const { return m_character_map.character_map_data(); }
+    const Keyboard::CharacterMap& character_map() const { return m_character_map; }
+    void set_client(KeyboardClient* client) { m_client = client; }
+    void set_maps(const Keyboard::CharacterMapData& character_map, const String& character_map_name);
+
+private:
+    size_t generate_minor_device_number_for_mouse();
+    size_t generate_minor_device_number_for_keyboard();
+
+    size_t m_mouse_minor_number { 0 };
+    size_t m_keyboard_minor_number { 0 };
+    Keyboard::CharacterMap m_character_map;
+    KeyboardClient* m_client { nullptr };
+    RefPtr<I8042Controller> m_i8042_controller;
+    NonnullRefPtrVector<HIDDevice> m_hid_devices;
+};
+
+class KeyboardClient {
+public:
+    virtual ~KeyboardClient();
+    virtual void on_key_pressed(KeyEvent) = 0;
+};
+
+}